Astronomy & Space - Far Out - Measuring the Universe
How far is a star or a galaxy? Scaling and measuring the cosmos is a complex problem. Scientists are integrating mathematical applications and scientific technology to create standards. Distances are so vast they are described in light years ‚Ä∞√õ√í the distance light travels in a year. Nearby stars are measured by trigonometry ‚Ä∞√õ√í the technique of parallax. Farther out, astronomers use so-called ‚Ä∞√õ√èstandard candles‚Ä∞€ù, the ‚Ä∞√õ√∑Type Ia supernovae‚Ä∞€™ is the standard candle basis. Beyond that the electromagnetic ‚Ä∞√õ√èredshift‚Ä∞€ù of galaxies reveals their distances.